Tests conducted by Minamisoma on about 900 residents showed low levels of internal radiation exposure and no one required immediate treatment, despite the city's proximity to the leaking Fukushima No. 1 nuclear plant, municipal officials said Saturday.

When converted to exposure over the next 50 years, one resident measured just above 1 millisievert of radioactive cesium, while tests on most of the other residents revealed exposure of 0.1 millisievert or less, they said. The maximum radiation exposure limit for a person not involved in nuclear-related work is 1 millisievert per year.